Frankie Knuckles - "The Whistle Song" (1991)

Knuckles at his most angel-hair delicate, seeming to soundtrack the latest moment possible in the longest night imaginable. An ambient synth wash and feather-brushed cymbals provide just enough structure for an electronically modulated flute to roam carelessly, its open-ended abandon suggesting, in the best possible way, that its melodic improvisation might go on forever. The synthetic chirp that joins in, and gives the song its name, suggests and inspires a spirit of camaraderie that's jaunty but never corny.